全文获取类型
收费全文 | 1972篇 |
免费 | 214篇 |
国内免费 | 773篇 |
专业分类
安全科学 | 361篇 |
废物处理 | 18篇 |
环保管理 | 204篇 |
综合类 | 1576篇 |
基础理论 | 228篇 |
污染及防治 | 160篇 |
评价与监测 | 137篇 |
社会与环境 | 203篇 |
灾害及防治 | 72篇 |
出版年
2024年 | 28篇 |
2023年 | 80篇 |
2022年 | 136篇 |
2021年 | 180篇 |
2020年 | 115篇 |
2019年 | 143篇 |
2018年 | 91篇 |
2017年 | 130篇 |
2016年 | 153篇 |
2015年 | 150篇 |
2014年 | 124篇 |
2013年 | 175篇 |
2012年 | 171篇 |
2011年 | 216篇 |
2010年 | 134篇 |
2009年 | 115篇 |
2008年 | 119篇 |
2007年 | 129篇 |
2006年 | 119篇 |
2005年 | 89篇 |
2004年 | 64篇 |
2003年 | 70篇 |
2002年 | 56篇 |
2001年 | 34篇 |
2000年 | 19篇 |
1999年 | 16篇 |
1998年 | 14篇 |
1997年 | 14篇 |
1996年 | 14篇 |
1995年 | 10篇 |
1994年 | 7篇 |
1993年 | 8篇 |
1992年 | 7篇 |
1991年 | 2篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1988年 | 1篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 2篇 |
1971年 | 1篇 |
排序方式: 共有2959条查询结果,搜索用时 125 毫秒
901.
Reetta Orsila Tiina Luukkaala Marja-Liisa Manka Clas-Håkan Nygard 《International journal of occupational safety and ergonomics》2013,19(4):341-359
The main aim of this study was to develop a short questionnaire to assess work-related well-being from the organizational behaviour perspective. The short well-being questionnaire enables measuring longitudinal work-related well-being. Work-related well-being was assessed with a 147-item questionnaire covering both organizational and intrinsic factors of work-related well-being. The questionnaire consisted of 27 categories. The respondents were 114 women (65%) and 62 men (35%), mean age 39.2 years, in various occupations. From the extensive questionnaire a shorter questionnaire with 33 items was developed by principal component analysis. The Kaiser-Meyer-Olkin measure to test the sampling adequacy of 27 factor solutions varied from .62 to .91 and Cronbach’s a was .74–.94. Most K values of the shorter questionnaire were .50–.94 (p < .001). The reliability of the short version was comparable to that of the original questionnaire. The short one could also be suitable for Internet and mobile questionnaire applications. 相似文献
902.
采用事故树分析法,对林华煤矿历次的煤与瓦斯突出事故资料进行了定性、定量分析,得出构造为林华煤矿煤与瓦斯突出事故的主控因素。运用分形理论对林华煤矿突出主控构造的特征进行分析,发现构造分布符合分形规律,信息维法比盒维法更能表征构造的分形特征。林华矿信息维数达到或超过一定数值的范围内,应采取抽放瓦斯等综合防突措施,加大防突力度。 相似文献
903.
904.
李秋波 《中国环境管理干部学院学报》2013,(3):65-68,76
结合紫外法测定水质中总氮空白校正吸光度值易偏高、测定结果准确度低的问题,分别从检测试剂含氮量、选择实验用水、清洗玻璃器皿、改进实验操作、改进消解环境等多个方面分析了各影响因素对总氮测定的影响,相应提出了采用测定含氮量的方法筛选试剂、新制备的去离子水作为总氮实验用水、每次总氮实验使用新刷好的器皿、增加颠倒混匀步骤提高测定结果的准确度和精密度、高压蒸汽灭菌器应定时清洗换水等对策与建议。 相似文献
905.
沿海地区人地关系演化及优化分析 总被引:9,自引:0,他引:9
人地关系是人类社会同周围环境之间的相互关系,在不同时期,随着人类社会的发展表现特征不同。本文以沿海地区“人”与“地”之间矛盾的产生、发展以及追求协调的历史过程为线索,将人地关系的发展变化历程划分为混沌阶段、原始和谐阶段、矛盾发展阶段、矛盾激化调整四个阶段。影响人地关系的因素较多,自然因素主要是地形、气候、地理位置、自然资源等,人为因素主要包括人口的急剧增长以及人类各种不合理的破坏性活动。从人地关系演化的历史过程,可知人地关系的发展是一个动态的过程,针对沿海地区的实际情况,沿海地区应突出以下几个方面以优化人地关系:①利用中国加入世贸组织为契机,深化对外开放;②通过生态工作建设、产业结构调整、城市化等实现社会经济、资源与环境的协调发展;③大力发展海洋经济,以缓解陆上资源与环境的压力。 相似文献
906.
907.
V. A. Yakovlev 《Russian Journal of Ecology》2002,33(4):268-272
Classification of the mode of life and behavior of zoobenthic, nektobenthic, and neustonic organisms was used as a basis for elucidating the formation of ethological structure of their communities in small lakes and streams of northeastern Fennoscandia. It is shown that the general response of these communities to anthropogenic impact is manifested in the reduction of the number of ethological groups. The specific response to eutrophication and heat pollution involves a decrease in the relative biomass of clingers and burrowers and an increase in the biomass of sprawling–walking and wormy animals; the response to toxic pollution and acidification is manifested in the prevalence of sprawlers–walkers. 相似文献
908.
Data on the daily activity and mobility of the common shrew (Sorex araneusL.) were obtained by the method of animal marking and recapturing in test plots. Sex- and age-related differences in the locomotor activity of animals were revealed, which depended on population size and the phase of the population cycle. Under natural conditions, animal activity in the daytime proved to decrease to a lesser extent than in captivity. The mobility (locomotor activity) of shrews was shown to depend on population density, reproductive rate, and weather. 相似文献
909.
Sylvia Früiiwirth-Schnatter 《Environmental and Ecological Statistics》1996,3(4):291-309
Model diagnostics for normal and non-normal state space models are based on recursive residuals which are defined from the one-step ahead predictive distribution. Routine calculation of these residuals is discussed in detail. Various diagnostic tools are suggested to check, for example, for wrong observation distributions and for autocorrelation. The paper also discusses such topics as model diagnostics for discrete time series and model discrimination via Bayes factors. The case studies cover environmental applications such as analysing a time series of the number of daily rainfall occurrences and a time series of daily sulfur dioxide emissions. 相似文献
910.
Studies performed from 1979 to 1998 provided data on the efficiency of natural reproduction of the stellate sturgeon Acipenser stellatus in the upper, middle, and lower spawning zones of the Volga. A correlation between the size of the progeny and environmental factors was revealed. Today, the main factors limiting the efficiency of reproduction in the stellate sturgeon are the numbers of fish admitted to the spawning grounds (especially in 1997 and 1998) and water level in the Volga during the summer low-water season. Measures to support natural reproduction of the stellate sturgeon are proposed. 相似文献